An automated high-sensitivity optical emission spectrometer

Abstract

The present invention discloses an automated high-sensitivity optical emission spectrometer, comprising: an installation cabinet; a light source mechanism, the light source mechanism is fixedly installed on the left side of the installation cabinet; a spectroscopic detection mechanism, the spectroscopic detection mechanism is fixedly installed on the right side of the installation cabinet; an atomization mechanism, the atomization mechanism is located in the inner cavity of the installation cabinet; a cooling mechanism, the cooling mechanism is fixedly sleeved on the surface of the atomization mechanism, and the cooling mechanism is installed in the inner cavity of the installation cabinet. The present invention has the advantage of high efficiency, and solves the problem that the existing high-sensitivity optical emission spectrometer is not convenient for efficient and automated processing of samples to be detected during use, which reduces the overall working efficiency of the spectrometer, and the graphite tube is difficult to cool quickly, which affects the subsequent sampling.

Description

Technical Field

[0001] The invention relates to the technical field of optical detection equipment, in particular to an automated high-sensitivity optical emission spectrometer. Background Art

[0002] A spectrometer is a scientific instrument used to measure and analyze spectra. It works by breaking down light into its constituent wavelengths or frequencies and measuring the intensity distribution of these wavelengths. Spectrometers can be used to identify the composition of substances and measure the physical properties of substances. Spectrometers can be divided into many types according to their uses and technical characteristics. Among them, the atomic absorption spectrometer is used to measure atomic absorption spectra and determine the concentration of specific elements in samples. Its basic working principle is based on atomic absorption spectroscopy, that is, measuring the absorption intensity of the ground state atomic vapor of the element to be measured to the characteristic radiation from the light source, thereby determining the concentration of the element in the sample.

[0003] An atomic absorption spectrometry measurement device and method with Chinese patent application number 202311360640.9, the device includes a gaseous atom generation module, an optical path detection module, a multi-pass cell module, and a signal processing module. The gaseous atom generation module is used to convert a solid sample into a gaseous atom beam distributed in a vacuum chamber; the optical path detection module is used to emit detection light passing through the gaseous atom beam to the vacuum chamber and receive the light beam passing through the gaseous atom beam and form an electrical signal; the multi-pass cell module is used to output the detection light after passing the gaseous atom beam in the vacuum chamber back and forth multiple times; the signal processing module is used to process the electrical signal and analyze the type and concentration of the sample.

[0004] During use, the existing high-sensitivity optical emission spectrometer is not convenient for efficient and automated processing of samples to be detected, which reduces the overall working efficiency of the spectrometer. In addition, the graphite tube is difficult to cool quickly, which affects subsequent sampling. Summary of the invention

[0005] The purpose of the present invention is to provide an automated high-sensitivity optical emission spectrometer with the advantage of high efficiency, which solves the problem that the existing high-sensitivity optical emission spectrometer is not convenient for efficient and automated processing of samples to be detected during use, reduces the overall working efficiency of the spectrometer, and the graphite tube is difficult to cool quickly, affecting subsequent sampling.

[0006] To achieve the above object, the present invention provides the following technical solution: an automated high-sensitivity optical emission spectrometer, comprising:

[0007] Install the cabinet;

[0008] A light source mechanism, wherein the light source mechanism is fixedly installed on the left side of the installation cabinet;

[0009] A spectroscopic detection mechanism, wherein the spectroscopic detection mechanism is fixedly installed on the right side of the installation cabinet;

[0010] an atomization mechanism, the atomization mechanism being located in the inner cavity of the installation cabinet;

[0011] A cooling mechanism, wherein the cooling mechanism is fixedly sleeved on the surface of the atomization mechanism and installed in the inner cavity of the installation cabinet;

[0012] A cooling liquid cooling mechanism, which is installed on the left and right sides of the inner cavity of the installation cabinet and is connected to the cooling mechanism;

[0013] A sample discharging mechanism, which is installed on the top of the atomization mechanism and is in communication with the atomization mechanism, and is fixedly connected to the left and right sides of the inner cavity of the installation cabinet;

[0014] A sample injection mechanism, the sample injection mechanism is connected to the sample injection end of the atomization mechanism;

[0015] An automatic sample changing mechanism, the automatic sample changing mechanism is fixedly installed on the front side of the installation cabinet and located at the bottom of the sample feeding mechanism, and the bottom of the sample feeding mechanism is fixedly connected to the automatic sample changing mechanism;

[0016] The gas carrier mechanism is installed at the rear side of the installation cabinet, and the gas outlet end of the gas carrier mechanism is connected to the atomization mechanism.

[0017] As a preferred automated high-sensitivity optical emission spectrometer of the present invention, the light source mechanism includes a light source cabinet body, a light source emitter is fixedly installed on the right side of the inner cavity of the light source cabinet body, the emission end of the light source emitter passes through the inner cavity of the installation cabinet, and a plurality of hollow cathode lamps are fixedly installed on the left side of the light source emitter.

[0018] As a preferred automated high-sensitivity optical emission spectrometer of the present invention, the spectroscopic detection mechanism includes a detection cabinet, a controller is fixedly installed on the front side of the detection cabinet, a light entrance hole is opened on the left side of the detection cabinet, the light entrance hole is located on the right side of the emitting end of the light source transmitter, and a collimating optical element, a dispersion element, a focusing optical element and a detector are fixedly installed in the inner cavity of the detection cabinet, the collimating optical element receives the light emitted from the light entrance hole and reflects it to the dispersion element, the dispersion element emits the light to the focusing optical element, and the focusing optical element emits the light to the detector.

[0019] As a preferred automated high-sensitivity optical emission spectrometer of the present invention, the atomization mechanism includes a graphite furnace, a first thermocouple and an electrical connector are fixedly installed on the right side of the graphite furnace, a first insulating heat-insulating ring is fixedly connected to the front end of the graphite furnace, a second insulating heat-insulating ring is fixedly connected to the rear end of the graphite furnace, a sample outlet elbow is fixedly connected to the rear side of the second insulating heat-insulating ring, and an air inlet head connected to the sample outlet elbow is fixedly installed on the right side of the sample outlet elbow.

[0020] As an automated high-sensitivity optical emission spectrometer preferably of the present invention, the cooling mechanism includes a plurality of cooling channels, the inner side of the cooling channel is fixedly connected with an insulating heat-conducting plate, the insulating heat-conducting plate is fixedly installed on the surface of the graphite furnace, the front side of the cooling channel surface is connected with a liquid inlet ring pipe, the rear side of the cooling channel surface is connected with a liquid outlet ring pipe, the left side of the liquid inlet ring pipe is connected with a liquid inlet pump, the liquid inlet end of the liquid inlet pump is connected with a liquid inlet pipe, the right side of the liquid outlet ring pipe is connected with a liquid outlet pump, the liquid outlet end of the liquid outlet pump is connected with a liquid outlet pipe, and the liquid inlet pump and the liquid outlet pump are fixedly installed at the bottom of the inner cavity of the installation cabinet.

[0021] As a preferred automated high-sensitivity optical emission spectrometer of the present invention, the coolant cooling mechanism includes two air inlet mesh cylinders, and the two air inlet mesh cylinders are respectively fixedly installed on the left and right sides of the inner cavity of the installation cabinet, and a cooling pipe is fixedly installed in the inner cavity of the air inlet mesh cylinder, the liquid inlet pipe is connected to the front end of the cooling pipe on the left, and the liquid outlet pipe is connected to the front end of the cooling pipe on the right, and the cooling pipe is connected to a connecting pipe on the opposite side, and a plurality of annular heat sinks are fixedly sleeved on the surface of the cooling pipe, and heat dissipation holes are opened on the annular heat sink, and a conical tube connected to it is fixedly installed at the rear end of the air inlet mesh cylinder, and the conical tube passes through to the rear side of the installation cabinet, and a fan is fixedly installed at the rear end of the conical tube.

[0022] As a preferred automated high-sensitivity optical emission spectrometer of the present invention, the sample output mechanism includes a sample output flat tube, the front and rear sides of the sample output flat tube are fixedly connected with fixing parts, the fixing parts are fixedly installed on the left and right sides of the inner cavity of the installation cabinet, the bottom of the sample output flat tube is connected to a constant temperature tube, the bottom of the constant temperature tube is connected to a first solenoid valve, the bottom of the first solenoid valve is connected to the top of the sample output bent tube, and a heating wire and a second thermocouple are fixedly installed on the surface of the constant temperature tube.

[0023] As a preferred automated high-sensitivity optical emission spectrometer of the present invention, the sampling mechanism includes a peristaltic pump, the liquid outlet end of the peristaltic pump is connected to a second solenoid valve, the second solenoid valve is fixedly installed at the front end of the first insulating and heat-insulating ring and is connected thereto, the liquid inlet end of the peristaltic pump is connected to a sampling hose, the bottom of the sampling hose is connected to a sampling head, the top of the sampling head is fixedly connected to a fixed bent rod, the rear end of the fixed bent rod is fixedly connected to the front side of the peristaltic pump, and the left side of the peristaltic pump is fixedly connected to a support seat.

[0024] As an automated high-sensitivity optical emission spectrometer preferably according to the present invention, the automatic sample changing mechanism includes a frame, the bottom of the support seat is fixedly connected to the frame, the frame is fixedly installed on the front side of the installation cabinet, a rotating rod is rotatably connected inside the frame, a placement plate is fixedly connected to the top of the rotating rod, a plurality of sample bottles are installed on the top of the placement plate, the sampling head is located at the top of the sample bottle, a large gear is fixedly sleeved on the bottom of the rotating rod surface, a stepper motor is fixedly connected to the bottom of the frame, a pinion is fixedly connected to the output shaft of the stepper motor, the pinion is meshed with the large gear, a cylinder is fixedly connected to the front and rear sides of the bottom of the frame, the piston rod of the cylinder passes through the top of the frame and is fixedly connected to a top plate, and the top of the top plate is movably connected to the bottom of the sample bottle.

[0025] As a preferred automated high-sensitivity optical emission spectrometer of the present invention, the carrier gas mechanism includes an argon gas cylinder, a gas cylinder fixing seat is installed at the bottom of the surface of the argon gas cylinder, the gas cylinder fixing seat is fixedly installed on the rear side of the installation cabinet, a fixing ring is fixedly installed on the right side of the gas cylinder fixing seat by bolts, the fixing ring is installed on the right side of the argon gas cylinder to fix it, the top of the argon gas cylinder is connected to a manual control valve, the gas outlet end of the manual control valve is connected to a third solenoid valve, the gas outlet end of the third solenoid valve is connected to an air inlet pipe, and the air inlet pipe is connected to an air inlet head.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention can collect the light emitted by the hollow cathode lamp by setting a light source emitter, and make the light reach the sample through a specific path. The hollow cathode lamp is a part of the light source, which can emit light of a specific wavelength, which corresponds to the characteristic emission line of the element to be measured. The main body of the light source cabinet provides physical support for the light source and protects the light source from external interference. By using the hollow cathode lamp, characteristic spectral lines of sufficient intensity can be provided.

[0028] 2. The present invention can receive light from the light source transmitter by setting a light entrance hole, ensuring that the light can directly enter the spectroscopic detection mechanism, thereby reducing the loss in the light path. The light first passes through the collimating optical element. The function of this element is to adjust the incident light beam into parallel light. The collimation is to ensure that the light beam can be correctly propagated in the subsequent optical elements to reduce the diffusion and loss of light. Next, the light reaches the dispersive element. The dispersive element is usually a grating or a prism, which can disperse light of different wavelengths to form a spectrum. This is because light of different wavelengths will undergo different degrees of refraction or reflection when passing through the dispersive element, so that they are arranged in order of wavelength. The focusing optical element is responsible for refocusing the dispersed light to a point, which is the position of the detector. The detector receives the focused spectrum and converts it into an electrical signal. The recorded signal will be further processed and analyzed. The light is dispersed into a spectrum by the dispersive element, so that each wavelength of light can be detected separately, thereby improving the detection resolution. The detector can improve the detection capability of weak signals. By using the collimating optical element and the focusing optical element in combination, the accurate capture of the spectral signal can be ensured, thereby improving the accuracy of the analysis result.

[0029] 3. The present invention can accommodate and heat samples by setting up a graphite furnace. When current passes through the graphite furnace, the graphite furnace will heat up rapidly. The power connector is used to connect the power supply to provide current to the graphite furnace to heat the graphite furnace. The first thermocouple is used to monitor the temperature inside the graphite furnace. By accurately controlling the temperature, it can be ensured that the sample is completely evaporated and atomized under appropriate conditions. The first insulating heat-insulating ring and the second insulating heat-insulating ring are used to isolate the graphite furnace from the surrounding environment to reduce heat loss and protect other mechanical parts from high temperature. The sample outlet elbow is used to guide the atomized sample gas to leave the graphite furnace and enter the sample outlet mechanism. The air inlet head is connected to the carrier gas mechanism to lead the sample out of the graphite furnace.

[0030] 4. The present invention surrounds the cooling channel on the surface of the graphite furnace and is in close contact with the graphite furnace through the insulating heat conductive sheet, so as to ensure that the heat of the graphite furnace can be quickly transferred to the cooling channel after high-temperature operation. The coolant flows into the cooling channel through the liquid inlet ring pipe and then flows out through the liquid outlet ring pipe. The liquid inlet ring pipe is connected to the liquid inlet pump, and the liquid outlet ring pipe is connected to the liquid outlet pump to realize the circulation of the coolant. The liquid inlet pipe (and the liquid outlet pipe) are respectively connected to the liquid inlet pump, the liquid outlet pump and the coolant cooling mechanism, and are used to transport the coolant to quickly take away the heat generated by the graphite furnace after high-temperature operation, accelerate the cooling speed of the graphite furnace, and prepare for the next analysis. Through rapid cooling, the waiting time between two analyses can be shortened, thereby improving the overall analysis efficiency.

[0031] 5. The present invention can introduce external air by installing the air inlet mesh tube on the left and right sides of the inner cavity of the installation cabinet. The air inlet mesh tube is equipped with cooling pipes inside. These cooling pipes are used to transmit the coolant from the cooling mechanism. The coolant enters the cooling pipe from the liquid inlet pipe. When passing through the cooling pipe, the coolant exchanges heat with the external air. The surface of the cooling pipe is equipped with a plurality of annular heat sinks. These heat sinks are provided with heat dissipation holes, which increase the contact area between the coolant and the air, thereby improving the heat exchange efficiency and accelerating the heat dissipation process of the coolant. The conical tube is connected to the rear end of the air inlet mesh tube and extends to the outside of the installation cabinet. The fan is installed at the end of the conical tube to suck in external air and pass through the annular heat sinks around the cooling pipe. Air is introduced around the cooling pipe by forced convection to take away the heat in the coolant. The temperature of the coolant can be quickly and effectively reduced, thereby improving the efficiency of the cooling system.

[0032] 6. The present invention can guide the sample gas into the installation cabinet by setting a sample outlet flat tube, and can facilitate the light emitted by the light source mechanism to pass through the sample. The sample outlet flat tube is connected to the sample outlet end of the graphite furnace to ensure that the sample can smoothly enter the next step after atomization. The fixing parts are used to fix the sample outlet flat tube on the left and right sides of the inner cavity of the installation cabinet to ensure the stability and position of the sample outlet flat tube. The constant temperature tube is used to keep the temperature of the sample gas stable before entering the detection system. The constant temperature tube is equipped with a heating wire, which can be heated as needed to maintain a constant temperature to ensure that the sample gas maintains a certain temperature during the transmission process to prevent the sample from condensing or other adverse physical changes. The second thermocouple is used to monitor the temperature in the constant temperature tube to ensure that the temperature in the constant temperature tube is maintained within a set range. The first solenoid valve can control the flow of the sample gas and can be opened or closed when needed to control the timing of sample discharge.

[0033] 7. The present invention can extract samples from sample bottles and transport them to the graphite furnace through pipelines by setting a peristaltic pump, so as to achieve precise flow control and ensure that the volume of each injection is consistent. The second solenoid valve is installed at the liquid outlet end of the peristaltic pump to control the timing of the sample entering the graphite furnace. The injection process of the sample can be precisely controlled by switching the second solenoid valve to ensure that the sample enters the graphite furnace at the appropriate time. The sampling hose connects the peristaltic pump and the sampling head to transmit the sample. The sampling head is located above the automatic sample changing mechanism and is used to draw samples from the sample bottle. The sampling mechanism can ensure that the sample is accurately and efficiently transported to the graphite furnace, thereby improving the accuracy and reliability of the entire spectral analysis process.

[0034] 8. The present invention can install and fix other components by setting a frame. A plurality of sample bottles are installed on the placement plate, and these sample bottles are used to store samples to be analyzed. The large gear is fixed to the bottom of the rotating rod, and the small gear is connected to the output shaft of the stepper motor. The small gear is meshed with the large gear. When the output shaft of the stepper motor rotates, it will drive the large gear and the rotating rod to rotate together, so that the sample bottles on the placement plate are aligned with the sampling head in sequence. The cylinder is installed at the bottom of the frame, and its piston rod passes through the frame and is connected to the top plate. When the cylinder is actuated, the piston rod extends or retracts, and the top plate rises or falls, so that the sample bottle can be lifted up so that the sample can be absorbed by the sampling head. The automatic sample changing mechanism can realize the rapid replacement of samples, greatly improve the analysis efficiency, and can significantly reduce the manual operation time and improve the work efficiency of the laboratory.

[0035] 9. The present invention can store high-pressure argon gas by setting an argon gas cylinder. Argon gas, as an inert gas, will not react with samples at high temperatures. The gas cylinder fixing seat and the fixing ring are used to fix the argon gas cylinder to prevent it from moving or tilting during operation. The manual control valve is used to control the release of argon gas, and the flow rate of argon gas can be controlled by the manual control valve. The third solenoid valve is installed after the manual control valve to more accurately control the flow rate of argon gas and ensure the stability of the flow rate of argon gas. The air inlet pipe is connected to the air inlet head of the atomization mechanism to transport argon gas to the graphite furnace. By setting the carrier gas mechanism, a stable supply of argon gas can be ensured, thereby improving the accuracy and repeatability of the analysis results. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is the main axonometric view of the present invention;

[0037] Figure 2 It is a main cross-sectional isometric view of the present invention;

[0038] Figure 3 It is a front cross-sectional view of the light source mechanism of the present invention;

[0039] Figure 4 It is a top cross-sectional view of the spectroscopic detection mechanism of the present invention;

[0040] Figure 5 This is a main isometric view of the atomization mechanism of the present invention;

[0041] Figure 6 This is a front axonometric view of the cooling mechanism of the present invention;

[0042] Figure 7 This is a main axonometric view of the coolant cooling mechanism of the present invention;

[0043] Figure 8 It is a rear axonometric view of the coolant cooling mechanism of the present invention;

[0044] Fig. 9It is a top partial cross-sectional view of the cooling liquid cooling mechanism of the present invention;

[0045] Fig.10 For the present invention Fig. 9 A magnified view of middle;

[0046] Fig.11 This is a main axonometric view of the sample-discharging mechanism of the present invention;

[0047] Fig.12 This is a main axonometric view of the sample feeding mechanism of the present invention;

[0048] Fig.13 This is a main axonometric view of the automatic sample changing mechanism of the present invention;

[0049] Fig.14 This is a front axonometric view of the automatic sample changing mechanism of the present invention;

[0050] Fig.15 This is the main axonometric view of the gas-carrying mechanism of the present invention.

[0051] In the figure: 1. Installation cabinet; 2. Light source mechanism; 201. Light source cabinet body; 202. Hollow cathode lamp; 203. Light source emitter; 3. Spectroscopic detection mechanism; 301. Detection cabinet; 302. Controller; 303. Dispersion element; 304. Collimation optical element; 305. Light entry hole; 306. Detector; 307. Focusing optical element; 4. Atomization mechanism; 401. Graphite furnace; 402. Sample outlet elbow; 403. Air inlet head ; 404, second insulating heat-insulating ring; 405, first thermocouple; 406, power connector; 407, first insulating heat-insulating ring; 5, cooling mechanism; 501, cooling channel; 502, liquid inlet pump; 503, liquid inlet pipe; 504, insulating heat-conducting sheet; 505, liquid inlet ring pipe; 506, liquid outlet pipe; 507, liquid outlet pump; 508, liquid outlet ring pipe; 6, cooling liquid cooling mechanism; 601, air inlet mesh tube; 602, conical tube; 603, fan; 604, connecting pipe; 605, cooling pipe; 606, annular heat sink; 607, heat dissipation hole; 7, sample discharging mechanism; 701, sample discharging flat tube; 702, constant temperature tube; 703, heating wire; 704, first solenoid valve; 705, second thermocouple; 706, fixing part; 8, sample discharging mechanism; 801, peristaltic pump; 802, fixed bending rod; 803, support seat; 804, sampling head; 805, sampling hose; 806, first Second solenoid valve; 9, automatic sample changing mechanism; 901, frame; 902, top plate; 903, sample bottle; 904, placement plate; 905, cylinder; 906, rotating rod; 907, large gear; 908, stepping motor; 909, small gear; 10, gas carrier mechanism; 1001, argon gas bottle; 1002, manual control valve; 1003, third solenoid valve; 1004, air inlet pipe; 1005, gas bottle fixing seat; 1006, fixing ring. DETAILED DESCRIPTION Example 1

[0052] See also Figure 1-Figure 15 , an automated high-sensitivity optical emission spectrometer, comprising a mounting cabinet 1;

[0053] Furthermore, it also includes a light source mechanism 2 , which is fixedly installed on the left side of the installation cabinet 1 .

[0054] Furthermore, the light source mechanism 2 includes a light source cabinet body 201, a light source emitter 203 is fixedly installed on the right side of the inner cavity of the light source cabinet body 201, the emitting end of the light source emitter 203 penetrates into the inner cavity of the installation cabinet 1, and a plurality of hollow cathode lamps 202 are fixedly installed on the left side of the light source emitter 203.

[0055] By setting up the light source emitter 203, the light emitted by the hollow cathode lamp 202 can be gathered and the light can reach the sample through a specific path. The hollow cathode lamp 202 is a part of the light source, which can emit light of a specific wavelength, which corresponds to the characteristic emission lines of the elements to be measured. The light source cabinet body 201 provides physical support for the light source and protects the light source from external interference. By using the hollow cathode lamp 202, characteristic spectral lines of sufficient intensity can be provided.

[0056] Furthermore, it also includes a spectroscopic detection mechanism 3 , which is fixedly installed on the right side of the installation cabinet 1 .

[0057] Furthermore, the spectroscopic detection mechanism 3 includes a detection cabinet 301, a controller 302 is fixedly installed on the front side of the detection cabinet 301, a light entrance hole 305 is opened on the left side of the detection cabinet 301, and the light entrance hole 305 is located on the right side of the emitting end of the light source emitter 203. The inner cavity of the detection cabinet 301 is respectively fixedly installed with a collimating optical element 304, a dispersion element 303, a focusing optical element 307 and a detector 306. The collimating optical element 304 receives the light emitted from the light entrance hole 305 and reflects it to the dispersion element 303. The dispersion element 303 emits the light to the focusing optical element 307, and the focusing optical element 307 emits the light to the detector 306.

[0058] By setting the light entrance hole 305, the light from the light source transmitter 203 can be received, ensuring that the light can directly enter the spectroscopic detection mechanism 3, thereby reducing the loss in the light path. The light first passes through the collimating optical element 304. The function of this element is to adjust the incident light beam into parallel light. The collimation is to ensure that the light beam can be correctly propagated in the subsequent optical elements to reduce the diffusion and loss of light. Next, the light reaches the dispersion element 303. The dispersion element 303 is usually a grating or a prism, which can disperse light of different wavelengths to form a spectrum. This is because light of different wavelengths will undergo different degrees of refraction or reflection when passing through the dispersion element 303, Arranged in order of wavelength, the focusing optical element 307 is responsible for gathering the scattered light back to a point, which is the position of the detector 306. The detector 306 receives the focused spectrum and converts it into an electrical signal. The recorded signal will be further processed and analyzed. The light is dispersed into a spectrum through the dispersion element 303, so that each wavelength of light can be detected separately, thereby improving the detection resolution. The detector 306 can improve the detection capability of weak signals. The coordinated use of the collimating optical element 304 and the focusing optical element 307 can ensure the accurate capture of the spectral signal, thereby improving the accuracy of the analysis result.

[0059] Furthermore, it also includes an atomization mechanism 4 , which is located in the inner cavity of the installation cabinet 1 .

[0060] Furthermore, the atomization mechanism 4 includes a graphite furnace 401, on the right side of which are fixedly installed a first thermocouple 405 and an electrical connector 406, a front end of the graphite furnace 401 is fixedly connected to a first insulating heat-insulating ring 407, a rear end of the graphite furnace 401 is fixedly connected to a second insulating heat-insulating ring 404, a rear side of the second insulating heat-insulating ring 404 is fixedly connected to a sample outlet elbow 402, and on the right side of the sample outlet elbow 402 is fixedly installed an air inlet head 403 connected thereto.

[0061] By setting up the graphite furnace 401, the sample can be accommodated and heated. When the current passes through the graphite furnace 401, the graphite furnace 401 will heat up rapidly. The power connector 406 is used to connect the power supply to provide current to the graphite furnace 401 to heat the graphite furnace 401. The first thermocouple 405 is used to monitor the temperature inside the graphite furnace 401. By accurately controlling the temperature, it can be ensured that the sample is completely evaporated and atomized under appropriate conditions. The first insulating heat-insulating ring 407 and the second insulating heat-insulating ring 404 are used to isolate the graphite furnace 401 from the surrounding environment to reduce heat loss and protect other mechanical parts from high temperature. The sample outlet elbow 402 is used to guide the atomized sample gas to leave the graphite furnace 401 and enter the sample outlet mechanism 7. The gas inlet head 403 is connected to the gas carrier mechanism 10 to lead the sample out of the graphite furnace 401.

[0062] Furthermore, it also includes a cooling mechanism 5 , which is fixedly sleeved on the surface of the atomization mechanism 4 and installed in the inner cavity of the installation cabinet 1 .

[0063] Furthermore, the cooling mechanism 5 includes a plurality of cooling channels 501, the inner side of the cooling channel 501 is fixedly connected with an insulating heat conductive sheet 504, the insulating heat conductive sheet 504 is fixedly installed on the surface of the graphite furnace 401, the front side of the surface of the cooling channel 501 is connected with a liquid inlet ring pipe 505, the rear side of the surface of the cooling channel 501 is connected with a liquid outlet ring pipe 508, the left side of the liquid inlet ring pipe 505 is connected with a liquid inlet pump 502, the liquid inlet end of the liquid inlet pump 502 is connected with a liquid inlet pipe 503, the right side of the liquid outlet ring pipe 508 is connected with a liquid outlet pump 507, the liquid outlet end of the liquid outlet pump 507 is connected with a liquid outlet pipe 506, and the liquid inlet pump 502 and the liquid outlet pump 507 are fixedly installed at the bottom of the inner cavity of the installation cabinet 1.

[0064] By surrounding the cooling channel 501 on the surface of the graphite furnace 401 and closely contacting the graphite furnace 401 through the insulating heat conductive sheet 504, it can be ensured that after the graphite furnace 401 is operated at a high temperature, the heat can be quickly transferred to the cooling channel 501, and the coolant flows into the cooling channel 501 through the liquid inlet ring pipe 505, and then flows out through the liquid outlet ring pipe 508. The liquid inlet ring pipe 505 is connected to the liquid inlet pump 502, and the liquid outlet ring pipe 508 is connected to the liquid outlet pump 507 to realize the circulation of the coolant. The liquid inlet pipe 503 and the liquid outlet pipe 506 are respectively connected to the liquid inlet pump 502, the liquid outlet pump 507 and the coolant cooling mechanism 6, which are used to transport the coolant, quickly take away the heat generated by the graphite furnace 401 after the high temperature operation, speed up the cooling speed of the graphite furnace 401, and prepare for the next analysis. Through rapid cooling, the waiting time between two analyses can be shortened, thereby improving the overall analysis efficiency.

[0065] Furthermore, it also includes a cooling liquid cooling mechanism 6 , which is installed on the left and right sides of the inner cavity of the installation cabinet 1 and is connected to the cooling mechanism 5 .

[0066] Furthermore, the cooling liquid cooling mechanism 6 includes two air inlet mesh tubes 601, which are respectively fixedly installed on the left and right sides of the inner cavity of the installation cabinet 1. A cooling pipe 605 is fixedly installed in the inner cavity of the air inlet mesh tube 601. The liquid inlet pipe 503 is connected to the front end of the left cooling pipe 605, and the liquid outlet pipe 506 is connected to the front end of the right cooling pipe 605. The cooling pipe 605 is connected to a connecting pipe 604 on the opposite side. A plurality of annular heat sinks 606 are fixedly sleeved on the surface of the cooling pipe 605. The annular heat sink 606 is provided with heat dissipation holes 607. The rear end of the air inlet mesh tube 601 is fixedly installed with a conical tube 602 connected thereto. The conical tube 602 extends to the rear side of the installation cabinet 1, and a fan 603 is fixedly installed at the rear end of the conical tube 602.

[0067] By installing the air inlet mesh tube 601 on the left and right sides of the inner cavity of the installation cabinet 1, external air can be introduced. The air inlet mesh tube 601 is equipped with cooling tubes 605. These cooling tubes 605 are used to transmit the coolant from the cooling mechanism 5. The coolant enters the cooling tube 605 from the liquid inlet pipe 503. When passing through the cooling tube 605, the coolant exchanges heat with the external air. The surface of the cooling tube 605 is equipped with a plurality of annular heat sinks 606. These annular heat sinks 606 are provided with heat dissipation holes 607, which increase the contact area between the coolant and the air, thereby improving the heat exchange efficiency and accelerating the heat dissipation process of the coolant. The conical tube 602 is connected to the rear end of the air inlet mesh tube 601 and extends to the outside of the installation cabinet 1. The fan 603 is installed at the end of the conical tube 602, and is used to inhale external air and pass through the annular heat sinks 606 around the cooling tube 605. Air is introduced around the cooling tube 605 by forced convection to take away the heat in the coolant, which can quickly and effectively reduce the temperature of the coolant, thereby improving the efficiency of the cooling system.

[0068] Furthermore, it also includes a sample discharging mechanism 7 , which is installed on the top of the atomization mechanism 4 and is connected thereto, and the sample discharging mechanism 7 is fixedly connected to the left and right sides of the inner cavity of the installation cabinet 1 .

[0069] Furthermore, the sample outlet mechanism 7 includes a sample outlet flat tube 701, and the front and rear sides of the sample outlet flat tube 701 are fixedly connected with fixing parts 706, and the fixing parts 706 are fixedly installed on the left and right sides of the inner cavity of the installation cabinet 1. The bottom of the sample outlet flat tube 701 is connected to a constant temperature tube 702, and the bottom of the constant temperature tube 702 is connected to a first solenoid valve 704. The bottom of the first solenoid valve 704 is connected to the top of the sample outlet bent tube 402, and the surface of the constant temperature tube 702 is fixedly installed with a heating wire 703 and a second thermocouple 705.

[0070] By setting up the sample outlet flat tube 701, the sample gas can be guided into the installation cabinet 1, and the light emitted by the light source mechanism 2 can pass through the sample. The sample outlet flat tube 701 is connected to the sample outlet end of the graphite furnace 401 to ensure that the sample can smoothly enter the next step after atomization. The fixing part 706 is used to fix the sample outlet flat tube 701 on the left and right sides of the inner cavity of the installation cabinet 1 to ensure the stability and position of the sample outlet flat tube 701. The constant temperature tube 702 is used to keep the temperature of the sample gas stable before entering the detection system. The constant temperature tube 702 is equipped with a heating wire 703, which can be heated as needed to maintain a constant temperature to ensure that the sample gas maintains a certain temperature during the transmission process to prevent the sample from condensing or other adverse physical changes. The second thermocouple 705 is used to monitor the temperature in the constant temperature tube 702 to ensure that the temperature in the constant temperature tube 702 is maintained within a set range. The first solenoid valve 704 can control the flow of the sample gas and can be opened or closed when necessary to control the timing of sample discharge.

[0071] Furthermore, it also includes a sample injection mechanism 8 , which is connected to the sample injection end of the atomization mechanism 4 .

[0072] Furthermore, the sampling mechanism 8 includes a peristaltic pump 801, the liquid outlet end of the peristaltic pump 801 is connected to a second solenoid valve 806, the second solenoid valve 806 is fixedly installed at the front end of the first insulating and heat-isolating ring 407 and is connected thereto, the liquid inlet end of the peristaltic pump 801 is connected to a sampling hose 805, the bottom of the sampling hose 805 is connected to a sampling head 804, the top of the sampling head 804 is fixedly connected to a fixed bent rod 802, the rear end of the fixed bent rod 802 is fixedly connected to the front side of the peristaltic pump 801, and the left side of the peristaltic pump 801 is fixedly connected to a support seat 803.

[0073] By setting up a peristaltic pump 801, the sample can be extracted from the sample bottle 903 and transported to the graphite furnace 401 through a pipeline to achieve precise flow control and ensure that the volume of each injection is consistent. The second solenoid valve 806 is installed at the liquid outlet end of the peristaltic pump 801 to control the timing of the sample entering the graphite furnace 401. The sample injection process can be accurately controlled by switching the second solenoid valve 806 to ensure that the sample enters the graphite furnace 401 at the appropriate time. The sampling hose 805 connects the peristaltic pump 801 and the sampling head 804 to transfer the sample. The sampling head 804 is located above the automatic sample changing mechanism 9 and is used to draw the sample from the sample bottle 903. The sampling mechanism 8 can ensure that the sample is accurately and efficiently transported to the graphite furnace 401, thereby improving the accuracy and reliability of the entire spectral analysis process.

[0074] Furthermore, it also includes an automatic sample changing mechanism 9 , which is fixedly installed on the front side of the installation cabinet 1 and located at the bottom of the sample injection mechanism 8 , and the bottom of the sample injection mechanism 8 is fixedly connected to the automatic sample changing mechanism 9 .

[0075] Furthermore, the automatic sample changing mechanism 9 includes a frame 901, the bottom of the support seat 803 is fixedly connected to the frame 901, the frame 901 is fixedly installed on the front side of the installation cabinet 1, the frame 901 is rotatably connected with a rotating rod 906, the top of the rotating rod 906 is fixedly connected with a placement plate 904, a plurality of sample bottles 903 are installed on the top of the placement plate 904, the sampling head 804 is located on the top of the sample bottle 903, a large gear 907 is fixedly sleeved on the bottom of the surface of the rotating rod 906, a stepper motor 908 is fixedly connected to the bottom of the frame 901, the output shaft of the stepper motor 908 is fixedly connected with a small gear 909, the small gear 909 is meshed with the large gear 907, the front and rear sides of the bottom of the frame 901 are fixedly connected with a cylinder 905, the piston rod of the cylinder 905 passes through the top of the frame 901 and is fixedly connected with a top plate 902, and the top of the top plate 902 is movably connected to the bottom of the sample bottle 903.

[0076] By setting the frame 901, other components can be installed and fixed. A plurality of sample bottles 903 are installed on the placement plate 904. These sample bottles 903 are used to store samples to be analyzed. The large gear 907 is fixed to the bottom of the rotating rod 906, and the small gear 909 is connected to the output shaft of the stepper motor 908. The small gear 909 is meshed with the large gear 907. When the output shaft of the stepper motor 908 rotates, the large gear 907 and the rotating rod 906 are driven to rotate together, so that the sample bottles 903 on the placement plate 904 are aligned with the sampling head 804 in sequence. The cylinder 905 is installed at the bottom of the frame 901, and its piston rod passes through the frame 901 and is connected to the top plate 902. When the cylinder 905 is actuated, the piston rod extends or retracts, and the top plate 902 rises or falls, so that the sample bottle 903 can be lifted up so that the sample can be sucked by the sampling head 804. The automatic sample changing mechanism 8 can realize the rapid replacement of samples, greatly improve the analysis efficiency, and can significantly reduce the manual operation time and improve the work efficiency of the laboratory.

[0077] Furthermore, it also includes a gas carrier mechanism 10 , which is installed at the rear side of the installation cabinet 1 , and the gas outlet end of the gas carrier mechanism 10 is connected to the atomization mechanism 4 .

[0078] Furthermore, the gas carrier mechanism 10 includes an argon gas cylinder 1001, a gas cylinder fixing seat 1005 is installed on the bottom of the surface of the argon gas cylinder 1001, the gas cylinder fixing seat 1005 is fixedly installed on the rear side of the installation cabinet 1, a fixing ring 1006 is fixedly installed on the right side of the gas cylinder fixing seat 1005 by bolts, the fixing ring 1006 is installed on the right side of the argon gas cylinder 1001 to fix it, a manual control valve 1002 is connected to the top of the argon gas cylinder 1001, the gas outlet end of the manual control valve 1002 is connected to the third solenoid valve 1003, the gas outlet end of the third solenoid valve 1003 is connected to the air inlet pipe 1004, and the air inlet pipe 1004 is connected to the air inlet head 403.

[0079] By setting up the argon cylinder 1001, high-pressure argon gas can be stored. As an inert gas, argon gas will not react with samples at high temperatures. The cylinder fixing seat 1005 and the fixing ring 1006 are used to fix the argon cylinder 1001 to prevent it from moving or tilting during operation. The manual control valve 1002 is used to control the release of argon gas, and the flow rate of argon gas can be controlled by the manual control valve 1002. The third solenoid valve 1003 is installed after the manual control valve 1002 to more accurately control the flow rate of argon gas and ensure the stability of the flow rate of argon gas. The air inlet pipe 1004 is connected to the air inlet head 403 of the atomization mechanism 4 to transport argon gas to the graphite furnace 401. By setting up the carrier gas mechanism 10, a stable supply of argon gas can be ensured, thereby improving the accuracy and repeatability of the analysis results.

[0080] Example 2

[0081] See also Figure 1-Figure 15, an automated high-sensitivity optical emission spectrometer detection method, comprising the following steps:

[0082] S1. Sample preparation: prepare the sample to be analyzed into a sample solvent and then put it into a sample bottle 903.

[0083] S2, automatic sample change, start the automatic sample change mechanism 9, drive the rotating rod 906 to rotate through the stepping motor 908, so that the sample bottle 903 on the placement plate 904 is aligned with the sampling head 804, and the cylinder 905 is actuated to lift the sample bottle 903 so that the sample in the sample bottle 903 can be sucked by the sampling head 804.

[0084] S3, sampling, the peristaltic pump 801 is started, and the sample is drawn out from the sample bottle 903 through the sampling hose 805. The second solenoid valve 806 controls the timing of the sample entering the graphite furnace 401 to ensure that the sample is introduced at the appropriate time.

[0085] S5, atomization, the sample enters the graphite furnace 401, the power connector 406 heats the graphite furnace 401 through electric current, causing the sample to evaporate and atomize, the first thermocouple 405 monitors the temperature inside the graphite furnace 401 to ensure that the sample is completely evaporated and atomized under appropriate conditions, and the sample outlet bend 402 guides the atomized sample gas to leave the graphite furnace 401 and enter the sample outlet mechanism 7.

[0086] S6, cooling, the cooling mechanism 5 takes away the heat of the graphite furnace 401 through the coolant in the cooling channel 501, speeding up the cooling speed of the graphite furnace 401, the coolant circulates through the liquid inlet pump 502 and the liquid outlet pump 507, and the temperature is reduced by the coolant cooling mechanism 6, the fan 603 introduces air into the cooling pipe 605 by forced convection to take away the heat in the coolant.

[0087] S7, sample out. The sample out flat tube 701 in the sample out mechanism 7 guides the sample gas into the light emitting area. The constant temperature tube 702 and the heating wire 703 ensure the temperature stability of the sample gas during the transmission process. The second thermocouple 705 monitors the temperature in the constant temperature tube 702. The first solenoid valve 704 controls the flow of the sample gas.

[0088] S8, spectral detection, the light source transmitter 203 emits light, the hollow cathode lamp 202 provides light of a specific wavelength, the light passes through the sample, the ground state atoms selectively absorb the light of a specific wavelength, that is, their characteristic absorption spectrum, the degree of absorption is proportional to the concentration of the element in the sample, and then the light enters the spectroscopic detection mechanism 3 through the light entrance hole 305, the collimating optical element 304 adjusts the light into parallel light, the dispersing element 303 disperses the light into a spectrum, and the focusing optical element 307 focuses the dispersed light onto the detector 306, the detector 306 receives the focused spectrum, converts it into an electrical signal, and records and processes the data.

[0089] S9, data processing and analysis: the controller 302 receives the signal from the detector 306 and performs data processing. The analysis results are recorded and displayed on the controller 302 for further analysis and interpretation by the operator.

[0090] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automated high-sensitivity optical emission spectrometer, characterized in that: include: Installation cabinet (1); A light source mechanism (2), the light source mechanism (2) being fixedly mounted on the left side of the installation cabinet (1); A spectroscopic detection mechanism (3), wherein the spectroscopic detection mechanism (3) is fixedly installed on the right side of the installation cabinet (1); an atomization mechanism (4), wherein the atomization mechanism (4) is located in the inner cavity of the installation cabinet (1); A cooling mechanism (5), wherein the cooling mechanism (5) is fixedly sleeved on the surface of the atomization mechanism (4), and the cooling mechanism (5) is installed in the inner cavity of the installation cabinet (1); A cooling liquid cooling mechanism (6), the cooling liquid cooling mechanism (6) being installed on the left and right sides of the inner cavity of the installation cabinet (1) and being connected to the cooling mechanism (5); A sample discharging mechanism (7), the sample discharging mechanism (7) being mounted on the top of the atomization mechanism (4) and being in communication therewith, the sample discharging mechanism (7) being fixedly connected to the left and right sides of the inner cavity of the installation cabinet (1); A sample injection mechanism (8), the sample injection mechanism (8) being connected to a sample injection end of the atomization mechanism (4); An automatic sample changing mechanism (9), the automatic sample changing mechanism (9) being fixedly mounted on the front side of the installation cabinet (1) and located at the bottom of the sample feeding mechanism (8), the bottom of the sample feeding mechanism (8) being fixedly connected to the automatic sample changing mechanism (9); A gas carrier mechanism (10), the gas carrier mechanism (10) being installed on the rear side of the installation cabinet (1), and the gas outlet end of the gas carrier mechanism (10) being connected to the atomization mechanism (4); The cooling mechanism (5) comprises a plurality of cooling channels (501), the inner side of the cooling channel (501) is fixedly connected with an insulating heat conductive sheet (504), the insulating heat conductive sheet (504) is fixedly mounted on the surface of the graphite furnace (401), the front side of the surface of the cooling channel (501) is connected with a liquid inlet ring pipe (505), the rear side of the surface of the cooling channel (501) is connected with a liquid outlet ring pipe (508), the left side of the liquid inlet ring pipe (505) is connected with a liquid inlet pump (502), the liquid inlet end of the liquid inlet pump (502) is connected with a liquid inlet pipe (503), the right side of the liquid outlet ring pipe (508) is connected with a liquid outlet pump (507), the liquid outlet end of the liquid outlet pump (507) is connected with a liquid outlet pipe (506), and the liquid inlet pump (502) and the liquid outlet pump (507) are fixedly mounted on the bottom of the inner cavity of the installation cabinet (1); The cooling liquid cooling mechanism (6) comprises two air inlet net cylinders (601), the two air inlet net cylinders (601) are respectively fixedly installed on the left and right sides of the inner cavity of the installation cabinet (1), a cooling pipe (605) is fixedly installed in the inner cavity of the air inlet net cylinder (601), the liquid inlet pipe (503) is connected to the front end of the cooling pipe (605) on the left, the liquid outlet pipe (506) is connected to the front end of the cooling pipe (605) on the right, and the cooling pipe (605) is connected to a connecting pipe (604) on the opposite side. A plurality of annular heat sinks (606) are fixedly sleeved on the surface of the cooling pipe (605), and heat dissipation holes (607) are opened on the annular heat sink (606). A conical pipe (602) connected to the air inlet net cylinder (601) is fixedly installed at the rear end thereof, the conical pipe (602) passes through to the rear side of the installation cabinet (1), and a fan (603) is fixedly installed at the rear end of the conical pipe (602).

2. An automated high-sensitivity optical emission spectrometer according to claim 1, characterized in that: The light source mechanism (2) comprises a light source cabinet body (201), a light source emitter (203) being fixedly mounted on the right side of the inner cavity of the light source cabinet body (201), an emitting end of the light source emitter (203) penetrating into the inner cavity of the installation cabinet (1), and a plurality of hollow cathode lamps (202) being fixedly mounted on the left side of the light source emitter (203).

3. An automated high-sensitivity optical emission spectrometer according to claim 2, characterized in that: The spectroscopic detection mechanism (3) comprises a detection cabinet (301), a controller (302) is fixedly mounted on the front side of the detection cabinet (301), a light entrance hole (305) is opened on the left side of the detection cabinet (301), and the light entrance hole (305) is located on the right side of the emission end of the light source emitter (203); a collimating optical element (304), a dispersive element (303), a focusing optical element (307) and a detector (306) are respectively fixedly mounted in the inner cavity of the detection cabinet (301), the collimating optical element (304) receives light emitted from the light entrance hole (305) and reflects it onto the dispersive element (303), the dispersive element (303) emits light onto the focusing optical element (307), and the focusing optical element (307) emits light onto the detector (306).

4. The automated high-sensitivity optical emission spectrometer according to claim 3, characterized in that: The atomization mechanism (4) comprises a graphite furnace (401), a first thermocouple (405) and an electrical connector (406) are fixedly installed on the right side of the graphite furnace (401), a first insulating heat-insulating ring (407) is fixedly connected to the front end of the graphite furnace (401), a second insulating heat-insulating ring (404) is fixedly connected to the rear end of the graphite furnace (401), a sample outlet elbow (402) is fixedly connected to the rear side of the second insulating heat-insulating ring (404), and an air inlet head (403) connected to the sample outlet elbow (402) is fixedly installed on the right side of the sample outlet elbow (402).

5. An automated high-sensitivity optical emission spectrometer according to claim 4, characterized in that: The sample outlet mechanism (7) comprises a sample outlet flat tube (701), the front and rear sides of the sample outlet flat tube (701) are fixedly connected with fixing parts (706), the fixing parts (706) are fixedly installed on the left and right sides of the inner cavity of the installation cabinet (1), the bottom of the sample outlet flat tube (701) is connected to a constant temperature tube (702), the bottom of the constant temperature tube (702) is connected to a first electromagnetic valve (704), the bottom of the first electromagnetic valve (704) is connected to the top of the sample outlet curved tube (402), and the surface of the constant temperature tube (702) is fixedly installed with a heating wire (703) and a second thermocouple (705).

6. An automated high-sensitivity optical emission spectrometer according to claim 5, characterized in that: The sampling mechanism (8) comprises a peristaltic pump (801), the liquid outlet end of the peristaltic pump (801) is connected to a second solenoid valve (806), the second solenoid valve (806) is fixedly mounted on the front end of the first insulating heat-insulating ring (407) and is connected thereto, the liquid inlet end of the peristaltic pump (801) is connected to a sampling hose (805), the bottom of the sampling hose (805) is connected to a sampling head (804), the top of the sampling head (804) is fixedly connected to a fixed curved rod (802), the rear end of the fixed curved rod (802) is fixedly connected to the front side of the peristaltic pump (801), and the left side of the peristaltic pump (801) is fixedly connected to a support seat (803).

7. An automated high-sensitivity optical emission spectrometer according to claim 6, characterized in that: The automatic sample changing mechanism (9) comprises a frame (901), the bottom of the support seat (803) is fixedly connected to the frame (901), the frame (901) is fixedly installed on the front side of the installation cabinet (1), the frame (901) is rotatably connected to a rotating rod (906) inside, the top of the rotating rod (906) is fixedly connected to a placement tray (904), a plurality of sample bottles (903) are installed on the top of the placement tray (904), the sampling head (804) is located on the top of the sample bottle (903), and the bottom of the surface of the rotating rod (906) is fixedly connected to the sample bottle (903). A large gear (907) is sleeved thereon, a stepper motor (908) is fixedly connected to the bottom of the frame (901), an output shaft of the stepper motor (908) is fixedly connected to a small gear (909), the small gear (909) meshes with the large gear (907), the front and rear sides of the bottom of the frame (901) are fixedly connected to a cylinder (905), a piston rod of the cylinder (905) penetrates to the top of the frame (901) and is fixedly connected to a top plate (902), and the top of the top plate (902) is movably connected to the bottom of the sample bottle (903).

8. An automated high-sensitivity optical emission spectrometer according to claim 7, characterized in that: The gas carrier mechanism (10) comprises an argon gas cylinder (1001), a gas cylinder fixing seat (1005) is installed at the bottom of the surface of the argon gas cylinder (1001), the gas cylinder fixing seat (1005) is fixedly installed on the rear side of the installation cabinet (1), a fixing ring (1006) is fixedly installed on the right side of the gas cylinder fixing seat (1005) by bolts, and the fixing ring (1006) is installed on the right side of the argon gas cylinder (1001) to fix it, and the top of the argon gas cylinder (1001) is connected to a manual control valve (1002), the gas outlet end of the manual control valve (1002) is connected to a third solenoid valve (1003), the gas outlet end of the third solenoid valve (1003) is connected to an air inlet pipe (1004), and the air inlet pipe (1004) is connected to an air inlet head (403).

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